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Posted in response to What constitutes a geode? from Ward on September 22, 2010 at 13:26:15:

Re: What constitutes a geode?

Ward, a geode is a naturally occuring rock body, usually hollow, that differs from the matrix rock in which it formed. It can be made of any material, commonly agate or other form of silica, but can also be various carbonates, sulfates, oxides, etc.
The dividing line between geode, nodule, crystal-lined pocket, or concretion can be pretty fuzzy at times. Bottom line, call it whatever you like and good hunting!

From MikeR - September 23, 2010 at 08:47:42
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